Masafumi Ishii

Title: **Innovations by Masafumi Ishii**

Introduction

Masafumi Ishii is a notable inventor based in Ibaraki, Japan, recognized for his contributions to the field of semiconductor materials and electronic apparatuses. With a total of three patents to his name, his work reflects a dedication to advancing technology in materials that are crucial for circuit board production.

Latest Patents

Among his latest innovations, Ishii has patented methods and solutions pivotal for electrical engineering. His patents include:

1. A method for producing copper sulfate, which also details the specifications for a copper sulfate solution.

2. A method for producing a semiconductor circuit board that incorporates copper sulfate with an iron concentration of 0.08 ppm by mass or lower.

3. A method for producing an electronic apparatus that employs an innovative copper foil provided with a carrier. This copper foil, designed for laminate applications, has an ultrathin copper layer that can be effectively peeled from the carrier, presenting a ten-point average roughness (Rz) of 6.0 µm or less, when evaluated using a laser microscope.

Career Highlights

Ishii is currently associated with JX Nippon Mining & Metals Corporation, where his expertise plays a crucial role in research and development projects. His contributions have not only advanced the company's objectives but also set new benchmarks in the industry standards regarding material applications.

Collaborations

Throughout his career, Ishii has had the privilege of collaborating with talented coworkers, including Misato Honda and Nobuaki Miyamoto. These partnerships have fostered innovation and helped share knowledge that contributes to their collective success in the advancements of semiconductor technologies.

Conclusion

Masafumi Ishii's innovative work in developing new methods for producing critical materials in electronic applications highlights the importance of continued research in the field. His patents demonstrate a commitment to improving processes and materials that are vital to the technology industry. Through his role at JX Nippon Mining & Metals Corporation and his collaborative efforts with esteemed colleagues, Ishii is making significant strides in shaping the future of semiconductor circuit boards and electronic apparatuses.